import sun.misc.Unsafe;

import java.lang.reflect.Field;

public class DirectMemoryOOM {
    private static final int _1M = 1024*1024;
    public static void main(String[] args) throws IllegalAccessException {
        Field unsafeField = Unsafe.class.getDeclaredFields()[0];
        unsafeField.setAccessible(true);
        Unsafe unsafe =(Unsafe)unsafeField.get(null);
        while (true){
            unsafe.allocateMemory(_1M);
        }
    }
}
